code: def test_call_gpu(self):
      self._test_call(gpu=0)
  
file_path: pfrl/tests/nn_tests/test_mlp_bn.py
imports: import unittest
  import numpy
  import pytest
  import torch
  import pfrl
label_desc: Use image node_id 4 for calling the TestMLPBN obj's underlying member method code with example usage: obj.test_call_gpu() without return types